dma: imx-sdma: Add new dma type for ssi dual fifo script

This patch adds a new DMA_TYPE for SSI dual FIFO script, included
in SDMA firmware version 2. This script would allow SSI use dual
fifo mode to transimit/receive data without occasional hardware
underrun/overrun.

Signed-off-by: Nicolin Chen <b42378@freescale.com>
Acked-by: Kumar Gala <galak@codeaurora.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

3 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
index 4fa814d38321..68b83ecc3850 100644
--- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
@@ -42,6 +42,7 @@ The full ID of peripheral types can be found below.
         19      IPU Memory
         20      ASRC
         21      ESAI
+        22      SSI Dual FIFO   (needs firmware ver >= 2)
 
 The third cell specifies the transfer priority as below.
 
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index f769c7383536..152247675feb 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -725,6 +725,10 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
                 per_2_emi = sdma->script_addrs->app_2_mcu_addr;
                 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
                 break;
+        case IMX_DMATYPE_SSI_DUAL:
+                per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
+                emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
+                break;
         case IMX_DMATYPE_SSI_SP:
         case IMX_DMATYPE_MMC:
         case IMX_DMATYPE_SDHC:
diff --git a/include/linux/platform_data/dma-imx.h b/include/linux/platform_data/dma-imx.h
index beac6b8b6a7b..bcbc6c3c14c0 100644
--- a/include/linux/platform_data/dma-imx.h
+++ b/include/linux/platform_data/dma-imx.h
@@ -39,6 +39,7 @@ enum sdma_peripheral_type {
         IMX_DMATYPE_IPU_MEMORY, /* IPU Memory */
         IMX_DMATYPE_ASRC,       /* ASRC */
         IMX_DMATYPE_ESAI,       /* ESAI */
+        IMX_DMATYPE_SSI_DUAL,   /* SSI Dual FIFO */
 };
 
 enum imx_dma_prio {